Segmental cup grinder wheel



Sept. 26, 1933. L. E. KOSS SEGMENTAL CUP GRINDER WHEEL Filed Jan. 30,1952 INVENTOR.

1041/: f. Kass.

ATTORNEY-5.

Patented Sept. 26, 1933 UNITED STATES PATENT OFFICE 7 Claims.

This invention relates to a segmental grinding wheel of the ring, cup orcylinder type commonly used for plain surfacegrinding.

The chief object of this invention is to simplify the construction of agrinding wheel of the aforesaid general character and simultaneouslyincorporate all of the advantages of a so-called complete peripheralgrinding structure with the advantages of the substantially complete orslotted peripheral grinding structure and omit the disadvantages of bothtypes inherent therein by reason of their constructions. No claim ismade to the broad combination of a grinding wheel base or segmentsupporting plate and a plurality of segments peripherally arranged andwedgingly anchored to said plate.

The invention is specifically directed to the particular structuralarrangement of the beforementioned parts whereby certain advantageshereinafter pointed out more in detail, are obtained.

Another feature of the invention consists in the formation of animperforate grinder wheel segment which has a base with a central angleother than the grinding portion whereby substantially segment to segmentcontact is obtained for anchorage and substantially slotted segmentalarrangement is obtained for grinding, the latter permitting the wheel tofree itself from the worn dust and metal ground by the wheel. As aresult of this freeing action, the face of the wheel requiressubstantially no dressing but .will progressively wear down until thewearing face is positioned too close to the supporting portion of thewheel for grinding with safety.

Anotherfeature of the invention consists in forming the supporting basewith but a single inclined face for wedging anchorage of the segments,forming the segments with buta single inclined face for wedginganchorage thereof and associating both inclined faces with wedging meanshaving oppositely inclined faces, whereby a single anchorage of a singlewedge is adapted to anchor a single segment. r

45 Another feature of the invention consists in the addition of aretaining counter-balanced segment engaging band. r v i The full natureof the invention will be more clearly understood from the accompanyingdrawing and the following description and claims:

In the drawing, Fig. 1 is a face view of the grinder wheel. Fig. 2 is acentral sectional view taken on line 2-2 of Fig. 1 and in the direction5 of the arrows. Fig. Sis a face view of one-of i the segments. Fig. 4is a sectional view: taken on the segments together in peripheralrelation.

line 4-4 of Fig. 3 and in the direction of the arrows. Fig. 5 is a sideelevation of one of the segments.

In the drawing 10 indicates a base plate which 7 has a groove formingstructure 11 rigid therewith 0 and herein shown integral. The grooveforming structure includes a flange l2 and a flange 13, the two beingconcentrically arranged to provide a groove therebetween having the baseor root face 14, an inner face 15, and an outer face In the present formof the invention, face 15 is shown inclined outwardly and face 16 isshown parallel to the axis. In other words, it is of cylindricalformation while face 15 is of conical formation.

Each segment includes a base portion 17 and a grinding portion 18havingthe grinding face 19 remote from the base. The base portion 17, asappears clearly in Fig. 3, has a-central angle that is less than thecentral angle of the grinding portion 18. This is because the radialface 21 of the base 17 is parallel tothe face 20 of the grinding portion18 although the base and grinding portions have one curved surface 22with a common radius. The opposite surface of the grinding portion iscurved as at 23 and in the present form of the invention but one curvedportion of the base is flared outwardly away from the grinding portion.Herein the inner curved faces of the grinding segment base haveconcentric curvatures of dissimilar radii by reason of the conicalformation of surface 24.

A suitable number of segments. are arranged end to end andrform asubstantially cylindrical grinder of the ring or cup type and by reasonof the lateral projection of the base beyond the grinding portion of thesegment, the grinding portions are spaced from each other by the slots30, thus permitting the wheel to free itself from debris that occurs inoperation.

All of the segmentsare identical, thereby reducing the cost ofproduction thereof to a minimum. A wedge member 25 is of arcuatecharacter and has substantially the same central angle as the segmentbase. Each wedge includes inclined faces that are of partial conicalcharacter, one face 26, and herein the outer'face, being ofsubstantially the same slope or inclination as face 24 of the segmentwhile the opposite and herein inner face 27 of the wedge has sub- 105stantially the same inclination as the adjacent inclined inner face 15of the inner flange. Each wedge maybe suitably drawn into the groove forwedging each segment in position and looking all Herein the simplestform of such means is illustrated and includes a bolt 28 that passesthrough an opening 29 in the portion 11 of'the groove. Each wedge has athreaded opening 31 that receives the bolt.

While the invention is illustrated as having all of the inclined facespositioned within the inner peripheral outline of the grinding face, thestructure maybe readily reversed Without departing from the invention.The advantage of having a clamping structure positioned within the innerperipheral outline of the clamping face is that the overall dimension ofthe supporting base is reduced to a minimum and since substantially theentire interior of the wheel is not uti lized for any purpose except formounting the wheel on a rotating shaft, this space in the present formof the invention is utilized for the clamping or mounting of thesegments upon the base.

When the segments are initially assembled and to prevent any tendency towobble or wiggle, there is provided a clamping band, the same beingindicated at 40. The band may be suitably formed but is ofsplitformation and includes the end anchoring elements 41 and 42. Afillister screw 43 extends through the end 41 and has threadedengagement as at 44 with the end clamp 42.

To maintain the dynamic balance of the wheel, the band supports indiametrical relation to the clamping structure, a counterweight 45 thatherein is shown anchored by the rivets 46 to the band. Likewise, thewheel includes a plurality of spaced recesses 47 and suitable weightingis positioned therein as by pressing in a lead weight 48 or the like todynamically'balance the wheel base.

To obtain the desired tensile strength at minimum cost the base is madeof brass or bronze.

The invention claimed is:

1. A segmental cup grinder wheel including a supporting base platehaving an outer peripheral flange, an inner flange concentric therewithand extending in the same direction from the plate as the firstmentioned flange to form a segment receiving groove, the face of but oneof said flanges exposed to the groove being inclined outwardly from theroot of the groove, the other flange groove exposed face beingsubstantially parallel to the wheel axis, aplurality of grindersegments, each having an anchoring base portion and an arcuate grindingportion, each segment base portion having a substantially partialcylindrical conformation for parallel face operative association and aconcentric conical conformation for its opposite face and forco0peration with the flange inclined face to secure the segments to thewheel, arcuate clamping wedges receivable by the groove, each havingconcentric oppositely inclined partial conical faces for segment conicalface and flange inclined face operative engagement, and means associatedwith the base and each wedge for drawing the latter toward the former toanchor the segment to the base.

tions when assembled in wheel formation, each segment base portionhaving a substantially partial cylindrical conformation for parallelface operative association and a concentric conical conformation for itsopposite face and for cooperation with the flange inclined face tosecure the segments to the wheel, arcuate clamping wedges receivable bythe groove, each having concentric oppositely inclined partial conicalfaces for segment conical face and flange inclined face operativeengagement, and means associated with the base and each wedge fordrawing the latter toward the former to anchor the segment to the base.

3. A segmental cup grinder wheel including a supporting base platehaving an outer peripheral flange, an inner flange concentric therewithand extending in the same direction from the plate as the firstmentioned flange to form a segment receiving groove, the face of but oneof said flanges exposed to the groove being inclined outwardly from theroot of the groove, the other flange groove exposed face beingsubstantially parallel to the wheel axis, a plurality of grindersegments, each having an anchoring base portion and an arcuate grindingportion, each segment base portion having a substantially partialcylindrical conformation for parallel face operative association, and aconcentric conical conformation for its opposite face and forcooperation with the flange inclined face to secure the segments to thewheel, 'arcuate clamping wedges receivable by the groove and havingsubstantially the same central angle as the adjacent segment base.

4. A segmental cup grinder wheel including a supporting base platehaving an outer peripheral flange, an inner flange concentric therewithand extending in the same direction from the plate as the firstmentioned flange to form a segment receiving groove, the face of but oneof said flanges exposed to the groove being inclined outwardly from theroot of the groove, the other flange groove. exposed face beingsubstantially parallel to the wheel axis, a plurality of grindersegments, each having an anchoring base portion and an arcuate grindingportion, said base portionbeingadapted for spacing the grinding portionswhen assembled in wheel formation,..

each segment base portion having a substantially partial cylindricalconformation for parallel face operative association and a concentricconical conformation for its opposite face and for cooperation with theflange inclined face to secure the segments to the wheelfarcuateclamping wedges, receivable by the groove and having substantially thesame central angle as the adjacent segment base.

5. A segmental cup grinder wheel including a supporting base platehaving an outer peripheral flange, an inner flange concentric therewithand extendingin the same direction from the plate as the first mentionedflange to form a segment receiving groove, the face of but one of saidflanges exposed to the groove being inclined outwardly from the root ofthe groove, the other flange :groove exposed face being substantiallyparallel to the wheel axis, a plurality of imperforate identical grindersegments, each having an anchoring base portion and an arcuate grindingportion,

each segment base portion having a substantially partial cylindricalconformation for parallel face operative association and a concentricconical conformation for its opposite face and for cooperation with theflange inclined face to secure the segments to the wheel, arcuateclamping wedges receivable by the groove, each having concentricoppositely inclined partial conical faces for segment conical face andflange inclined face operative engagement, and means associated with thebase and each wedge for drawing the latter toward the former to anchorthe segment to the base..

6. A segmental cup grinder wheel including a supporting base platehaving an outer peripheral flange, an inner flange concentric therewithand extending in the same direction from the plate as the firstmentioned flange to form a segment receiving groove, the face of but oneof said flanges exposed to the groove being inclined outwardly from theroot of the groove, the other flange groove exposed face beingsubstantially parallel to the wheel axis, a plurality of imperforateidentical grinder segments, each having an anchoring base portion and anarcuate grinding portion, said base portion having a. central angledifferent from the grinding portion for spacing the grinding portionswhen assembled in wheel formation, each segment base portion having asubstantially partial cylindrical conformation for parallel faceoperative association and a concentric conical conformation for itsopposite face and for cooperation with the flange inclined face tosecure the segments to the wheel, arcuate clamping wedges receivable bythe groove, each having concentric oppositely inclined partial conicalfaces for segment conical face and flange inclined face operativeengagement, and means associated with the base and each wedge fordrawing the latter toward the former to anchor the segment to the base.

7. A segmental cup grinder wheel including a supporting base platehaving an outer peripheral flange, an inner flange concentric therewithand extending in the same'direction from the plate as the firstmentioned flange to form a segment receiving groove, the face of but oneof said flanges exposed to the groove being inclined outwardly from theroot of the groove, the other flange groove exposed face beingsubstantially parallel to the wheel axis, a plurality of imperforateidentical grinder segments, each having an anchoring base portion and anarcuate grinding portion, each segment base portion having asubstantially partial cylindrical, conformation for parallel faceoperative association and a concentric conical conformation for itsopposite face and for cooperation with the flange inclined face tosubstantially the same central angle as the adj acent segment base.

LOUIS E. KOSS.

